jQuery each2 plugin vs jQuery core .each method

JavaScript performance comparison

Revision 15 of this test case created by Scott Rycroft

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<!-- the plugin -->
<script src="http://github.com/cowboy/jquery-misc/raw/master/jquery.ba-each2.js"></script>

<script>
  // Create a whole bunch of elements for iteration.
  var elems = $('<div/>').append(Array(1000).join('<span/>')).children();
</script>
    

Preparation code output

<!-- the plugin --> <script src="http://github.com/cowboy/jquery-misc/raw/master/jquery.ba-each2.js"></script> <script> // Create a whole bunch of elements for iteration. var elems = $('<div/>').append(Array(1000).join('<span/>')).children(); </script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
jQuery core .each, $(this) x 2
elems.each(function(i, elem) {
 $(this); // Really inefficient code, you know,
 $(this); // like you see all over the web...
});
pending…
jQuery core .each, $(this) x 4
elems.each(function(i, elem) {
 $(this); // Really inefficient code, you know,
 $(this); // like you see all over the web...
 $(this); // Etc...
 $(this); // Etc...
});
pending…
jQuery core .each method
elems.each(function(i, elem) {
 var jq = $(this); // This is the best we can do here.
 jq; // No performance penalty.
 jq; // No performance penalty.
 jq; // No performance penalty.
});
pending…
jQuery each2 plugin
elems.each2(function(i, jq) {
 jq; // Use at will!
 jq; // No performance penalty.
 jq; // No performance penalty.
});
pending…
jQuery core .each, $(this) x 10
elems.each(function(i, elem) {
 for (var i = 0; i < 10; i++) {
  $(this); // Let's see the cost of doing $(this) 10x.
 }
});
pending…
Putting things into perspective...
elems.each2(function(i, jq) {
 // This should give some sense of how disproportionate the
 // $(this) savings are compared to actual DOM manipulations.
 jq.addClass('foo');
});
pending…
Putting things into perspective 2 ...
elems.each(function(i, elem) {
 $(this).addClass('foo');
});
pending…

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